A power conversion system includes an isolating transformer (30) and an output-controlling device (40). The isolating transformer (30) includes a primary winding (310) and a plurality of secondary windings (320a˜320d) coupled with the primary winding (310), and the isolating transformer (30) has a plurality of coupling distances between the secondary windings (320a˜320d). The output-controlling device (40) includes a controller (420) and a plurality of output-controlling modules (400a˜400d), wherein each one of the secondary windings (320a˜320d) is electrically connected to one of the output-controlling device (400a˜400d). The controller (420) places at least one output-controlling device (400a˜400d) in a conducting state for output a rectified power. An amount of the secondary windings (320a˜320d) coupled with the primary winding (310) is modulated for varying a leakage inductance of the power conversion system.
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1. A power conversion system comprising: an isolating transformer ( 30 ) comprising a primary winding ( 310 ) and a plurality of secondary windings ( 320 a ˜ 320 d ) coupled with the primary winding ( 310 ), wherein the isolating transformer ( 30 ) has a plurality of coupling distances between the secondary windings ( 320 a ˜ 320 d ) and the primary winding ( 310 ); an output-controlling device ( 40 ) comprising a plurality of output-controlling modules ( 400 a ˜ 400 d ), wherein each of the secondary windings ( 320 a ′˜ 320 d ) is electrically connected to one of the output-controlling modules ( 400 a ˜ 400 d ); a current sense unit ( 50 ) configured to sense a current required for an electronic device and generate a current sensed signal; and a controller ( 420 ) electrically connected to the output-controlling modules ( 400 a ˜ 400 d ) and the current sense unit ( 50 ); wherein the controller ( 420 ) is configured to control an amount of the output-controlling module ( 400 a ˜ 400 d ) placed in a conducting state in accordance with the current sense signal, thus an amount of the second winding ( 320 a ˜ 320 d ) magnetically coupled with the primary winding ( 310 ) is modulated for varying a leakage inductance of the power conversion system and providing an output current met the current requirement of the electronic device.
A power conversion system supplies current to an electronic device. It includes an isolating transformer with a primary winding and multiple secondary windings. The distance between each secondary winding and the primary winding is different. An output-controlling device contains multiple modules, each connected to one secondary winding. A current sensor measures the electronic device's current needs and sends a signal to a controller. The controller activates some of the output-controlling modules, allowing current to flow. By changing which secondary windings are active, the transformer's leakage inductance changes, adjusting the output current to match the electronic device's requirements.
2. The power conversion system of claim 1 , wherein there is no output current provided by the output-controlling module ( 400 a ˜ 400 d ) which is not placed in the conducting state.
The power conversion system described previously uses output-controlling modules. An output-controlling module that isn't actively switched on by the controller provides absolutely no output current. Only the modules that are conducting contribute to the total power supplied.
3. The power conversion system of claim 1 , wherein each of the output-controlling modules ( 400 a ˜ 400 d ) comprises a synchronous rectifying unit ( 410 a ˜ 410 d ), the controller ( 420 ) is electrically connected to the synchronous rectifying units ( 410 a ˜ 410 d ), each of the secondary windings ( 321 a ˜ 320 d ) is electrically connected to at least one of the synchronous rectifying unit ( 410 a ˜ 410 d ), and the controller ( 420 ) places at least one synchronous rectifying unit ( 410 a ˜ 410 ) in the conducting state for performing a synchronous rectifying procedure and providing the output current.
The power conversion system described previously uses output-controlling modules, each with a synchronous rectifier unit. The controller connects to each rectifier. Each secondary winding connects to at least one rectifier. The controller activates at least one rectifier to perform synchronous rectification, providing the output current. Synchronous rectification increases efficiency by actively switching rectifiers instead of using diodes.
4. The power conversion system of claim 1 , wherein each output-controlling module ( 400 ) comprises a synchronous rectifying unit ( 410 a ˜ 410 d ) and an output switch (SW 1 ˜SW 4 ), each output switch (SW 1 ˜SW 4 ) is electrically connected to one of the synchronous rectifying units ( 410 a ˜ 410 d ), the controller ( 420 ) places at least one switch (SW 1 ˜SW 4 ) in the conducting state for providing the output current.
The power conversion system described previously uses output-controlling modules, each with a synchronous rectifier unit and an output switch. Each switch connects to one rectifier. The controller activates at least one switch to provide the output current. The switches enable finer control over the current flow from each secondary winding.
5. The power conversion system of claim 1 , wherein the isolating transformer ( 30 ) further comprises: a bobbin ( 330 ), the secondary winding ( 320 a ˜ 320 d ) are assembled with the bobbin ( 330 ), the primary winding ( 310 ) is wound on the bobbin ( 330 ), wherein the primary winding ( 310 ) is wound at one side of each secondary winding ( 320 a ˜ 320 d ), such that the primary winding ( 310 ) and the secondary winding ( 320 a ˜ 320 d ) are in a staggered manner; and a magnetic core ( 340 ) assembled with the bobbin ( 330 ).
The isolating transformer in the power conversion system described previously includes a bobbin where the secondary windings are assembled. The primary winding is also wound on the bobbin. The primary winding is positioned alongside each secondary winding such that they are staggered. A magnetic core then surrounds the bobbin. This arrangement influences the leakage inductance between the primary and secondary windings.
6. The power conversion system of claim 1 , wherein the power conversion system has a lowest leakage inductance when all of the output-controlling modules ( 400 a ˜ 400 d ) are placed in the conducting state.
In the power conversion system described previously, the system achieves its lowest leakage inductance when all output-controlling modules are in the conducting state. Activating all modules maximizes the magnetic coupling between the primary and secondary windings, minimizing leakage inductance.
7. The power conversion system of claim 1 , wherein the secondary windings ( 320 a ˜ 320 d ) are arranged at both sides of the primary winding ( 310 ), the controller ( 420 ) interleaved places the synchronous rectifying units ( 410 a ˜ 410 d ) electrically connected to the secondary winding ( 320 ˜ 320 d ) with the same coupling distance in the conducting state for performing the synchronous rectifying procedure and providing the output current.
In the power conversion system described previously, the secondary windings are positioned on both sides of the primary winding. The controller activates synchronous rectifiers connected to secondary windings with similar coupling distances in an alternating fashion. This interleaved switching of symmetrically placed rectifiers performs synchronous rectification and provides the desired output current, helping balance the current distribution and minimize core saturation.
8. The power conversion system of claim 7 , wherein the controller ( 420 ) places the synchronous rectifying units ( 410 a ˜ 410 d ) in the conducting state for performing the synchronous rectifying procedure in sequence, the sequence of the synchronous rectifying units ( 410 a ˜ 410 d ) in the conducting state for performing synchronous rectifying procedure depends on distances between a central axis of the bobbin ( 330 ) and each of the synchronous rectifying units ( 410 a ˜ 410 d ), and the controller ( 420 ) interleaved places the synchronous rectifying units ( 410 a ˜ 410 d ) in the conducting state by gradually converges the distance between the central axis and the synchronous rectifying units ( 410 a ˜ 410 d ) in the conducting state.
The power conversion system described in the previous claim uses a controller to activate synchronous rectifiers in a specific sequence. The order of activation depends on the distance between the bobbin's center and each rectifier. The controller uses an interleaved pattern, gradually selecting rectifiers closer to the center axis. This approach allows fine-grained control over the output current by strategically engaging windings with progressively stronger magnetic coupling.
9. The power conversion system of claim 1 , wherein the controller ( 420 ) places the synchronous rectifying units ( 410 a ˜ 410 d ) in the conducting state for performing the synchronous rectifying procedure according to the current required for the electronic device sensed by the current sense unit ( 50 ).
The power conversion system described previously activates synchronous rectifiers based on the electronic device's current requirements, as detected by the current sensor. The controller monitors the current demand and dynamically adjusts which rectifiers are active to meet the load conditions efficiently.
10. The power conversion system of claim 1 , wherein the output current provided by the power conversion system decreases when the leakage inductance of the power conversion system is increased.
In the power conversion system described previously, the output current decreases when the leakage inductance increases. Higher leakage inductance reduces the magnetic coupling between the primary and secondary windings, limiting the amount of power that can be transferred.
11. The power conversion system of claim 1 , wherein the controller interleaved places the synchronous rectifying units ( 410 a ˜ 410 d ) with similar leakage inductance in the conducting state for performing the synchronous rectifying procedure and providing the output current.
In the power conversion system described previously, the controller uses an interleaved scheme to activate synchronous rectifiers with similar leakage inductance. This is done to perform synchronous rectification and to deliver the desired output current. By activating synchronous rectifiers with similar inductance, it ensures balanced current sharing.
12. A method for powering an electronic device comprising: providing the power conversion system comprising a primary winding ( 310 ) and a plurality of secondary windings ( 320 a ˜ 320 d ), wherein there are a plurality of coupling distances between the primary winding and the secondary windings; sensing a current required for the electronic device; modulating an amount of the secondary windings ( 320 a ˜ 320 d ) coupled with the primary winding ( 310 ) for varying a leakage inductance of the power conversion system, thus an output current provided by the power conversion system is modulated to meet the current requirement of the electronic device.
A method for powering an electronic device involves using a power conversion system that includes a primary winding and multiple secondary windings with different coupling distances. The method includes sensing the current needed by the device, then modulating the number of secondary windings coupled with the primary winding to change the power conversion system's leakage inductance. As a result, the power conversion system output current is modulated to align with the device's power demands.
13. The method of the claim 12 , further comprising: modulating an amount of the power-controlling modules ( 400 a ˜ 400 d ) placed in the conducting state for varying the leakage inductance of the power conversion system.
The method for powering an electronic device described previously includes modulating the number of power-controlling modules in a conducting state. Activating or deactivating these modules changes the leakage inductance of the power conversion system, allowing for precise control over the output current. This modulation supplements the basic current control described previously.
14. The method of claim 12 , wherein the power conversion system has a lowest leakage inductance when all of the output-controlling modules ( 400 a ˜ 400 d ) are placed in the conducting state, thus a largest output current is provided.
In the method for powering an electronic device described previously, the power conversion system achieves its lowest leakage inductance (and therefore the largest output current) when all output-controlling modules are in a conducting state. Enabling all modules maximizes the magnetic coupling between the primary and secondary windings.
15. The method of claim 12 , wherein the output current is provided by the power controlling module placed in the conducting state.
In the method for powering an electronic device described previously, the output current is only provided by the power-controlling module that is actively switched on, placed in the conducting state.
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March 17, 2016
December 5, 2017
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